The env variable of params does not take effect in Pre-requet-Script

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My question:

I used env variable inside params. But I need to use double quotes. I found this doesn’t work
Strings should contain double quotes.
Something like👇

var sendString = 'query="something"'

Details (like screenshots):
params


pre-request-Script

log
image

How I found the problem:
now

I’ve already tried:
i can’t fix